Portable information device

ABSTRACT

A portable information device is capable of securing the appearance quality or the durability of products while having a foldable configuration. The portable information device has a backbone member provided throughout and between the inner surface of one edge portion of a first chassis member and the inner surface of one edge portion of a second chassis member so as to cover a gap between the one edge portion of the first chassis member and the one edge portion of the second chassis member connected by a hinge mechanisms. The backbone member is held between the inner surfaces of the first chassis member and the second chassis member and the rear surfaces of the hinge mechanisms disposed on the inner surfaces, and is slidably provided between the inner surface of at least one of the first chassis member and the second chassis member and the rear surface of the hinge mechanism disposed on the one inner surface of the at least one of the first chassis member and the second chassis member.

FIELD OF THE INVENTION

The present invention relates to a portable information device provided with a foldable display on the inner sides of a pair of foldable chassis members.

BACKGROUND OF THE INVENTION

In recent years, portable information devices, such as a tablet PC and a smartphone having a touch panel type liquid crystal display and not having a physical keyboard, have rapidly spread. The display of this kind of portable information device has been desired to be large in use but has been desired to be miniaturized in carrying. Then, a portable information device has been proposed in which not only a chassis but a display is configured so as to be foldable by the use of a flexible display, such as organic EL (Electro Luminescence) (for example, see Patent Document 1).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2014-216025

SUMMARY OF THE INVENTION

As a chassis of the above-described folding structure, a configuration of connecting adjacent edge portions between a pair of chassis members arranged side by side on the right side and the left side by a hinge mechanism is mentioned, for example. However, with this configuration, when the pair of chassis members is closed into a double-folded state, a gap is generated between edge portions on the hinge sides of the chassis members. Then, internal elements are exposed from the gap, which has posed problems in the appearance quality, durability, and the like of products.

The present invention has been made considering the problems of the former technique described above. It is an object of the present invention to provide a portable information device capable of securing the appearance quality or the durability of products while having a foldable configuration.

A portable information device according to the present invention has a first chassis member and a second chassis member foldably connected by the connection of one edge portions disposed adjacent to each other by a hinge mechanism, a display which is provided over inner surfaces of the first chassis member and the second chassis member and which is foldable into a double-folded state, and a backbone member provided throughout and between the inner surface of the one edge portion of the first chassis member and the inner surface of the one edge portion of the second chassis member so as to cover a gap between the one edge portion of the first chassis member and the one edge portion of the second chassis member connected by the hinge mechanism, in which the backbone member is held between the inner surfaces of the first chassis member and the second chassis member, and the rear surfaces of the hinge mechanisms disposed on the inner surfaces, and is slidably provided between the inner surface of at least one of the first chassis member and the second chassis member and a rear surface of the hinge mechanism disposed on the inner surface of the at least one of the first chassis member and the second chassis member.

A configuration may be acceptable in which the hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, in which the first hinge chassis and the second hinge chassis each have a recessed portion communicating with each other on rear surface sides thereof, and the backbone member is disposed in the recessed portions.

A configuration may be acceptable in which the backbone member is provided to the inner surface of the one edge portion of the first chassis member so as to be slidable in a direction from the second chassis member to the first chassis member along the inner surface, and is non-slidably fixed to the inner surface of the one edge portion of the second chassis member.

A configuration may be acceptable in which the hinge mechanism is disposed at each of both end portions in the longitudinal direction of the one edge portions in the first chassis member and the second chassis member.

A configuration may be acceptable in which the hinge mechanism has the first hinge chassis fixed on the inner surface of the first chassis member, the second hinge chassis fixed on the inner surface of the second chassis member, and the hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, the first hinge chassis is held between the inner surface of the first chassis member and a wall portion raised from the inner surface of the first chassis member, and the second hinge chassis is held between the inner surface of the second chassis member and a wall portion raised from the inner surface of the second chassis member.

A configuration may be acceptable in which the hinge mechanism is disposed at each of both end portions in the longitudinal direction of the one edge portions in the first chassis member and the second chassis member, the wall portions of the first hinge chassis and the second hinge chassis each form side walls of the portable information device, and the first hinge chassis and the second hinge chassis are engaged with the recessed portions formed in the inner wall surfaces of the wall portions.

A configuration may be acceptable in which the hinge mechanism is disposed at each of both end portions in the longitudinal direction of the one edge portions in the first chassis member and the second chassis member, each of the hinge mechanisms is provided at a position located on the outside of the outer shape of the display, each hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, and at least a portion other than a bending region corresponding to the backbone member of the display is positioned and fixed to the first chassis member and the second chassis member, and the surface of the display and the axial center of the hinge shaft are disposed on the same plane in a state where the first chassis member and the second chassis member are opened into a flat shape.

A portable information device according to the present invention has a first chassis member and a second chassis member foldably connected by the connection of one edge portions disposed adjacent to each other by a hinge mechanism and a display which is provided over inner surfaces of the first chassis member and the second chassis member and which is foldable into a double-folded state, in which the hinge mechanism is disposed at each of both end portions in the longitudinal direction of the one edge portions in the first chassis member and the second chassis member, each hinge mechanism is provided at a position located on the outside of the outer shape of the display, each hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, the display is positioned and fixed to the first chassis member and the second chassis member, and the surface of the display and the axial center of the hinge shaft are disposed on the same plane in a state where the first chassis member and the second chassis member are opened into a flat shape.

A configuration may be acceptable in which each hinge mechanism has a first arm, one end portion of which is rotatably connected to the first hinge chassis through a first hinge shaft and the other end portion of which is rotatably connected to the second hinge chassis through a second hinge shaft and a second arm, one end portion of which is rotatably connected to the second hinge chassis through a third hinge shaft and the other end portion of which is rotatably connected to the first hinge chassis through a fourth hinge shaft; and the surface of the display and the axial centers of the first hinge shaft, the second hinge shaft, the third hinge shaft, and the fourth hinge shaft are disposed on the same plane in a state where the first chassis member and the second chassis member are opened into a flat shape.

The present invention can secure the appearance quality or the durability of products can be secured although having a foldable configuration.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a state where a portable information device according to one embodiment of the present invention is closed into a storage form.

FIG. 2 is a perspective view schematically illustrating a state where the portable information device illustrated in FIG. 1 is opened into a usage form.

FIG. 3 is a plan view schematically illustrating the internal structure of the portable information device illustrated in FIG. 2.

FIG. 4 is an enlarged perspective view of a principal portion in a state where a backbone member is omitted from the portable information device illustrated in FIG. 1.

FIG. 5 is an exploded perspective view of the backbone member.

FIG. 6A is a cross-sectional view schematically illustrating the cross-sectional structure along the VIA-VIA line in FIG. 1.

FIG. 6B is a cross-sectional view schematically illustrating the cross-sectional structure along the VIB-VIB line in FIG. 3.

FIG. 7A is a cross-sectional view schematically illustrating the cross-sectional structure along the VIIA-VIIA line in FIG. 1.

FIG. 7B is a cross-sectional view schematically illustrating the cross-sectional structure along the VIIB-VIIB line in FIG. 3.

FIG. 8 is a cross-sectional view schematically illustrating the cross-sectional structure along the VIII-VIII line in FIG. 2.

FIG. 9 is an enlarged perspective view of a principal portion illustrating the positional relationship between a display and a hinge mechanism.

FIG. 10A is a side view schematically illustrating the positional relationship between the display and the hinge mechanism in a state where a pair of chassis members is opened.

FIG. 10B is a side view illustrating a state where the pair of chassis members is operated so as to be closed from the state illustrated in FIG. 10A.

FIG. 10C is a side view illustrating a state where the pair of chassis members is further operated so as to be closed from the state illustrated in FIG. 10B.

FIG. 10D is a side view illustrating a state where the pair of chassis members is further operated so as to be closed from the state illustrated in FIG. 10C to be folded into a double-folded state.

FIG. 11 is a side view schematically illustrating the positional relationship between the display and the hinge mechanism in a state where the pair of chassis members is opened in a configuration having a hinge mechanism of a 3-shaft structure.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a preferable embodiment of a portable information device according to the present invention is described in detail with reference to the attached drawings.

1. Description of Entire Configuration of Portable Information Device

FIG. 1 is a perspective view illustrating a state where a portable information device 10 according to one embodiment of the present invention is closed into a storage form. FIG. 2 is a perspective view schematically illustrating a state where the portable information device 10 illustrated in FIG. 1 is opened into a usage form. FIG. 3 is a plan view schematically illustrating the internal structure of the portable information device 10 illustrated in FIG. 2.

As illustrated in FIG. 1 and FIG. 2, the portable information device 10 has a first chassis member 12A, a second chassis member 12B, a backbone member 14, and a display 16. This embodiment describes a tablet type PC which is foldable into a double-folded state like a book as an example of the portable information device 10. The portable information device 10 may be a cellular phone, a smartphone, an electronic notebook, or the like.

The chassis members 12A and 12B each are rectangular plate-like members in which the side wall is formed so as to be raised on three sides other than the side corresponding to the backbone member 14. The chassis members 12A and 12B each contain metal plates of stainless steel, magnesium, aluminum, and the like, fiber reinforced resin plates containing reinforced fibers, such as carbon fibers, and the like, for example. To the inner surface sides of the chassis members 12A and 12B, a display 16 is fixed through a support plate 18 (see also FIG. 6B). The chassis members 12A and 12B are connected through a pair of hinge mechanisms 19 and 19 provided in both end portions of the backbone member 14. The hinge mechanisms 19 connect the chassis members 12A and 12B so as to be foldable into the storage form illustrated in FIG. 1 and the usage form illustrated in FIG. 2. A line C illustrated by the dashed line in FIG. 3 represents a bending center C serving as the center of a folding operation of the chassis members 12A and 12B.

In the chassis members 12A and 12B, inner end surfaces 12Aa and 12Ba on the backbone member 14 side serve as hinge sides, and outer end surfaces 12Ab and 12Bb on the side opposite to the backbone member 14 serve as open end portion sides.

As illustrated in FIG. 3, a main substrate 20, a communication module 21, a cooling fan 22, and the like are attached and fixed to the inner surface of the first chassis member 12A using a screw or the like which is not illustrated. To the inner surface of the second chassis member 12B, a sub-substrate 24, an antenna 25, a battery device 26, and the like are attached and fixed using a screw or the like which is not illustrated. The main substrate 20 is an electronic substrate for performing the overall control of the portable information device 10 and carries various kinds of electronic components, such as a central processing unit (CPU) and a memory which are not illustrated. The communication module 21 is a device performing information processing of various wireless communications of wireless LAN (Local Area Network) and the like performing transmission and receiving with the antenna 25. The cooling fan 22 is a fan for cooling heat generated in the central processing unit and the like mounted on the main substrate 20. The sub-substrate 24 is an electronic substrate functioning as a controller controlling the display state of the display 16. The battery device 26 is a power supply of the portable information device 10 and can be charged from an external power supply through a power cable which is not illustrated.

The display 16 is a touch panel type liquid crystal display, for example. The display 16 is structured so as to be foldable together with the chassis members 12A and 12B when the chassis members 12A and 12B are folded. The display 16 is a flexible display, such as an organic EL having a paper structure with high flexibility, for example and is opened/closed with an opening/closing operation of the chassis members 12A and 12B.

The display 16 is attached and fixed to the inner surface sides of the chassis members 12A and 12B through the support plate 18 using a screw which is not illustrated. The rear surface of the display surface (front surface) of the display 16 is pasted and fixed to the surface of the support plate 18 using an adhesive, a double-sided tape, or the like. In the case of this embodiment, the support plate 18 has a pair of plate members 18 a and 18 a which are disposed on the inner surface sides of the chassis members 12A and 12B and are connected to each other so as to be bendable centering on the bending center C (see FIG. 6A and FIG. 6B). To the entire surface of the pair of plate members 18 a and 18 a, a sheet-like member 18 b is stuck, whereby the pair of plate members 18 a and 18 a is connected to each other so as to be bendable.

The plate members 18 a contain metal plates of stainless steel, magnesium, aluminum, and the like, fiber reinforced resin plates in which a matrix resin containing a thermosetting resin or a thermoplastic resin is impregnated with reinforced fibers, such as carbon fibers, and the like, for example. In this embodiment, a carbon fiber reinforced resin plate containing carbon fibers as a reinforced resin is used. The sheet-like member 18 b is a thin film containing a material having flexibility, such as a thin resin film or metallic foil. The sheet-like member 18 b is stuck to the entire surfaces of the plate members 18 a and 18 a. In this embodiment, metallic foil containing stainless steel is used as the sheet-like member 18 b. The display 16 is pasted to the surface of the sheet-like member 18 b using an adhesive or the like. In the sheet-like member 18 b, a portion covering adjacent end portions of the plate members 18 a functions as a bending portion (flexible hinge) of the support plate 18.

In the support plates 18, the adjacent end surfaces of the pair of plate members 18 a and 18 a abut on each other in the usage form in which the chassis members 12A and 12B are opened into a flat shape (see FIG. 6B). In the support plate 18, the adjacent end surfaces of the pair of plate members 18 a and 18 a are separated from each other in the storage form in which the chassis members 12A and 12B are folded into a double-folded state (see FIG. 6A).

As illustrated in FIG. 2, a bezel member 27 is disposed on an outer peripheral edge portion of the surface of the display 16 in the state of being attached and fixed to the inner surface sides of the chassis members 12A and 12B (see also FIG. 8). The bezel member 27 is provided so as to cover a non-displaying region (inactive region) R2 of the outer peripheral edge portion excluding a display region (active region) R1 of the surface of the display 16.

Thus, the portable information device 10 can be configured so as to be changed into the usage form illustrated in FIG. 1 and the storage form illustrated in FIG. 2 by opening/closing the display 16 provided on the inner side by opening/closing the pair of chassis members 12A and 12B.

Hereinafter, as illustrated in FIG. 1 to FIG. 3, the portable information device 10 is described designating a direction from the backbone member 14 to the outer end surfaces 12Ab and 12Bb as an X direction and a direction along the longitudinal direction of the backbone member 14 as a Y direction. With respect to the X direction, a direction from the backbone member 14 to the one outer end surface 12Ab is sometimes referred to as an X1 direction and a direction from the backbone member 14 to the other outer end surface 12Bb is sometimes referred to as an X2 direction. Similarly, with respect to the Y direction, a direction to one side (upper side in FIG. 3) in the longitudinal direction of the backbone member 14 is sometimes referred to as a Y1 direction and a direction to the other side (lower side in FIG. 3) is sometimes referred to as a Y2 direction.

2. Description of Hinge Mechanism

An example of the configuration of the hinge mechanism 19 connecting the chassis members 12A and 12B is described. FIG. 4 is an enlarged perspective view of a principal portion in a state where the backbone member 14 is omitted from the portable information device 10 illustrated in FIG. 1.

As illustrated in FIG. 3, the hinge mechanisms 19 each are disposed at positions overlapping with both end portions in the longitudinal direction of the backbone member 14. The hinge mechanisms 19 are provided at positions located on the outside of the outer shape of the display 16 and are linearly symmetrical with each other. The hinge mechanism 19 has a first hinge chassis 28A, a second hinge chassis 28B, a first arm 30, and a second arm 31.

The first hinge chassis 28A is a part of a thin block shape formed of resin, metal, or the like. The first hinge chassis 28A is fixed onto the inner surface of the first chassis member 12A using fixing screws 32. The second hinge chassis 28B is a part of a thin block shape formed of resin, metal, or the like. The second hinge chassis 28B is fixed onto the inner surface of the second chassis member 12B using the fixing screws 32.

The first hinge chassis 28A has a recessed portion 34 on the rear surface side landing on the inner surface of the first chassis member 12A. The recessed portion 34 has a recessed shape which is opened from the inner side surface (side surface on the Y2 side in the hinge mechanism 19 on the upper side in FIG. 3) of the first hinge chassis 28A to the side surface (side surface on the X2 side) on the bending center C side (also see FIG. 7A to FIG. 8). The second hinge chassis 28B has a recessed portion 35 on the rear surface side landing on the inner surface of the second chassis member 12B. The recessed portion 35 is a recessed shape which is opened from the inner side surface (side surface on the Y2 side in the hinge mechanism 19 of on the upper side in FIG. 3) of the second hinge chassis 28B to the side surface (side surface on the X1 side) on the bending center C side (also see FIG. 7A to FIG. 8). The recessed portions 34 and 35 communicate with each other with the bending center C interposed therebetween (see FIG. 3 and FIG. 7B).

While one end portion of the first arm 30 is rotatably connected to the first hinge chassis 28A through a first hinge shaft 36 a, the other end portion thereof is rotatably connected to the second hinge chassis 28B through a second hinge shaft 36 b (also see FIG. 7A and FIG. 7B). While one end portion of the second arm 31 is rotatably connected to the second hinge chassis 28B through a third hinge shaft 36 c, the other end portion is rotatably connected to the first hinge chassis 28A through a fourth hinge shaft 36 d (also see FIG. 7A and FIG. 7B).

The first arm 30 and the second arm 31 are arranged in parallel in the Y direction. The second hinge shaft 36 b of the first arm 30 is located at a position between the third hinge shaft 36 c and the fourth hinge shaft 36 d of the second arm 31. The third hinge shaft 36 c of the second arm 31 is located at a position between the first hinge shaft 36 a and the second hinge shaft 36 b of the first arm 30. Thus, the first arm 30 and the second arm 31 are alternately arranged side by side with a positional shift in the X direction and the Y direction.

In each hinge mechanism 19, when the chassis members 12A and 12B are folded centering on the bending center C, the arm members 30 and 31 rotate through the hinge shafts 36 a to 36 d (see FIG. 4). Thus, the hinge mechanisms 19 connect the chassis members 12A and 12B so as to be rotatable from the state in which the chassis members 12A and 12B are folded into a double-folded state to the state in which the chassis members 12A and 12B are opened into a flat shape.

3. Description of Backbone Member

The backbone member 14 is described. In the storage form illustrated in FIG. 1, inner end surfaces 12Aa and 12Ba of the chassis members 12A and 12B are greatly separated from each other to generate a gap (also see FIG. 4). Then, in the portable information device 10, the backbone member 14 is provided in order to prevent the display 16 and the elements, such as the main substrate 20 and the battery device 26, from being exposed by covering the gap. FIG. 5 is an exploded perspective view of the backbone member 14. FIG. 6A is a cross-sectional view schematically illustrating the cross-sectional structure along the VIA-VIA line in FIG. 1. FIG. 6B is a cross-sectional view schematically illustrating the cross-sectional structure along the VIB-VIB line in FIG. 3.

The backbone member 14 is a thin plate-like member having flexibility serving as the backbone in folding the portable information device 10. The backbone member 14 is provided throughout and between the chassis members 12A and 12B so as to cover the inner end surfaces 12Aa and 12Ba from the inner side while crossing the same (see FIG. 3, FIG. 6A, and FIG. 6B).

As illustrated in FIG. 5, the backbone member 14 has a sheet-like member (flexible sheet-like member) 40, a first support member 42, a second support member 43, and a plurality of reinforcing members 44 a, 44 b, 44 c, and 44 d.

The first support member 42 and the second support member 43 are thin plate-like members extending in the longitudinal direction (Y direction) of the backbone member 14. The reinforcing members 44 a to 44 d are thin plate-like members extending in the longitudinal direction of the backbone member 14 and are narrower in the X direction than the support members 42 and 43. The reinforcing members 44 a to 44 d are arranged side by side in the X2 direction from the first chassis member 12A to the second chassis member 12B between the support members 42 and 43. The first support member 42, the second support member 43, and the reinforcing members 44 a to 44 d are thin plate members formed of resin, metal, and the like.

The sheet-like member 40 is a fiber reinforced resin plate in which a thermosetting resin, such as epoxy resin, is impregnated with reinforced fibers, such as carbon fibers. The sheet-like member 40 is a thin sheet-like member of 0.3 mm or less, for example, and has flexibility and high strength. As the reinforced fibers, various materials, such as metal fibers, such as stainless steel fibers, and inorganic fibers, such as glass fibers, may be used. The sheet-like member 40 may be formed of a resin film, metallic foil, and the like.

The support members 42 and 43 and the reinforcing members 44 a to 44 d are stuck to the surface of the sheet-like member 40 using an adhesive, a double-sided tape, or the like. The support members 42 and 43 and the reinforcing members 44 a to 44 d and the sheet-like members 40 may be integrally formed. Thus, the backbone member 14 is bendable in connection with a folding operation of the chassis members 12A and 12B. In the sheet-like member 40, a portion covering the inner end surfaces 12Aa and 12Ba of the chassis members 12A and 12B serves as a bending portion 40 a (see FIG. 6A and FIG. 6B). The sheet-like member 40 has a plurality of notch portions 40 b arranged side by side in the Y direction in an edge portion on the second support member 43 side.

The first support member 42 is provided slidably in the X direction crossing the chassis members 12A and 12B along the inner surface of the first chassis member 12A on the inner surface side. The first support member 42 has pressing surfaces 42 a on the surfaces in both end portions in the longitudinal direction. The pressing surface 42 a is a surface one step lower than the other surfaces of the first support member 42. The first support member 42 has a plurality of groove portions 42 b in the X direction in the surface of a portion located between the pair of pressing surfaces 42 a and 42 a in the longitudinal direction. A side surface 42 c on the X2 side facing the reinforcing member 44 a of the first support member 42 forms an inclined surface retreating in the X1 direction from the reinforcing member 44 a side in a direction from the rear surface side (sheet-like member 40 side) to the front surface side (see FIG. 6A and FIG. 6B).

The first support member 42 receives energization force by a tension spring (elastic member) 45 along the X direction (see FIG. 3 and FIG. 6A). The tension spring 45 always energizes the backbone member 14 along the X1 direction in a direction from the second chassis member 12B to the first chassis member 12A.

The second support member 43 is non-slidably attached and fixed to the inner surface of the second chassis member 12B on the inner surface side using a fixing screw 46 (see FIG. 6A and FIG. 6B). The second support member 43 has pressing surfaces 43 a on the surfaces in both end portions in the longitudinal direction. The pressing surface 43 a is a surface one step lower than the other surfaces of the second support member 43. The second support member 43 has a plurality of groove portions 43 b in the X direction in the surface of a portion located between the pair of pressing surfaces 43 a and 43 a. Through-holes 47 for passing screw portions of the fixing screws 46 are provided at appropriate positions in the longitudinal direction of the second support member 43. The fixing screws 46 are fastened and fixed to the second chassis member 12B through the notch portions 40 b of the sheet-like member 40. A side surface 43 c on the X1 side facing the reinforcing member 44 d of the second support member 43 forms an inclined surface retreating in the X2 direction from the reinforcing member 44 d side in a direction from the rear surface side (sheet-like member 40 side) to the front surface side (see FIG. 6A and FIG. 6B).

Each of the reinforcing members 44 a to 44 d has a trapezoidal cross-sectional shape in which the upper bottom and the lower bottom are somewhat curved. A pressing surface 44 e which is a surface one step lower than the other surfaces is provided on the surfaces in both end portions in the longitudinal direction of each of the reinforcing members 44 a to 44 d (see FIG. 5). Each of the pressing surfaces 44 e is formed at substantially the same height as that of the pressing surfaces 42 a and 43 a of the support member 42 and 43 (see FIG. 7B). The number of the reinforcing members 44 a to 44 d can be changed as appropriate.

Each of the reinforcing members 44 a to 44 d has a side surface 48 a on the first support member 42 side (X1 side) and a side surface 48 b on the second support member side (X2 side) (see FIG. 6A and FIG. 6B). The two reinforcing members 44 a and 44 b close to the first support member 42 side and the two reinforcing members 44 c and 44 d close to the second support member 43 side are substantially linearly symmetrical with each other about the boundary between the reinforcing members 44 b and 44 c at the center. The side surface 48 a of the reinforcing member 44 a forms an inclined surface retreating in the X2 direction from the first support member 42 side in a direction from the rear surface side (sheet-like member 40 side) to the front surface side. The side surface 48 b of the reinforcing member 44 d forms an inclined surface retreating in the X1 direction from the second support member 43 side in a direction from the rear surface side (sheet-like member 40 side) to the front surface side. The other side surfaces 48 a and 48 b face the facing side surfaces 48 b and 48 a, respectively, substantially in parallel to each other or form an inclined surface in a direction of somewhat separating from each other.

In the storage form illustrated in FIG. 6A, the side surfaces 48 a and 48 b of the reinforcing members 44 a to 44 d abut on each other on the inner surface side of the bending portion 40 a of the sheet-like member 40 bent into a double-folded state to form an arch shape (arc shape) similar to a shape in which a plurality of teeth are arranged side by side without a gap. Herein, the side surfaces 48 a and 48 b of the reinforcing members 44 a and 44 d in both ends abut on the side surfaces 42 c and 43 c of the support member 42 and 43, respectively. Due to the arch shape, the inner end surfaces 12Aa and 12Ba are separated from each other, so that the reinforcing members 44 a to 44 d function as supports firmly supporting the chassis members 12A and 12B in the storage form with reduced rigidity. More specifically, in the vicinity of the backbone member 14 between the chassis members 12A and 12B, the hinge mechanisms 19 are provided in both end portions in the Y direction in the storage form but, in portions other than the both end portions, a portion having no rigidity extends in the Y direction. In the portable information device 10, the support members 42 and 43 and the reinforcing members 44 a to 44 b form supports of an arch shape extending in the Y direction to secure the rigidity in the thickness direction in the storage form.

In such a storage form, the inner end surfaces 12Aa and 12Ba of the chassis members 12A and 12B are disposed at the most separated positions. Therefore, the backbone member 14 is positioned at a retreated position where the first support member 42 side which is the slide side is drawn to the most inner end surface 12Aa side (X2 direction) on the inner surface of the first chassis member 12A. Herein, the first support member 42 slides to the inner end surface 12Aa side against the energization force of the tension spring 45.

On the other hand, in the usage form in which the chassis members 12A and 12B are opened into a flat shape, the reinforcing members 44 a to 44 d are disposed side by side in one row together with the support members 42 and 43 on the inner surfaces of the chassis members 12A and 12B. Therefore, the backbone member 14 takes a form of a flat shape having the minimum thickness. In the usage form, the inner end surfaces 12Aa of the chassis members 12A and 12B and 12Ba are disposed at positions where the inner end surfaces 12Aa are most close to or abut on each other. Therefore, the backbone member 14 is located at an advance position where the first support member 42 side which is the slide side advances to the outer end surface 12Ab side (X1 direction) opposite to the most inner end surface 12Aa side on the inner surface of the first chassis member 12A. Herein, the first support member 42 smoothly slides to the outer end surface 12Ab side by the energization force of the tension spring 45, and therefore the backbone member 14 does not cause floating or catching in sliding.

A wiring line 49 connecting the main substrate 20 and the sub-substrate 24, for example, is passed through the groove portions 42 b and 43 b crossing the chassis member 12A and 12B on the right side and the left side. Upper openings of the groove portions 42 b and 43 b are covered with a lid member 51 (see FIG. 6A). The lid member 51 is a thin film containing materials having flexibility, such as a thin resin film or metallic foil. The lid member 51 is provided over substantially the entire length excluding both end portions in the Y direction of the backbone member 14 and over the entire width in the X direction thereof and is pasted to the surface of the backbone member 14. In the case of this embodiment, a sheet-like member containing stainless steel (stainless steel sheet) is used for the lid member 51. An end portion on the X2 side of the lid member 51 is stuck to the surface of the second support member 43 and an end portion on the X1 side thereof is movably placed on the surface of the first support member 42, for example (see FIG. 6A and FIG. 6B). Therefore, the lid member 51 prevents the falling off of the wiring lines 49 from the groove portions 42 b and 43 b while sliding on the backbone member 14 following the slide of the backbone member 14. Therefore, the wiring lines 49 can be prevented from floating from the upper openings of the groove portions 42 b and 43 b and falling off on the outside of the groove portions 42 b and 43 b. Thus, in the portable information device 10, the lid member 51 containing metallic foil closes the groove portions 42 b and 43 b to prevent falling off of the wiring lines 49. Therefore, when the portable information device 10 is changed from the storage form illustrated in FIG. 6A to the usage form illustrated in FIG. 6B, for example, the lid member 51 is also bent together with the backbone member 14 so as to follow the bending operation of the pair of plate members 18 a and 18 a of the support plate 18. As a result, the wiring lines 49 can be certainly prevented from contacting adjacent end portions (edge) between the plate members 18 a and 18 a and the like, so that the durability and the reliability of the portable information device 10 are improved. The end portion on the X1 side which is the end portion on the slide side of the lid member 51 may be configured so as to extend beyond the end portion on the X1 side of the first support member 42. Thus, the wiring lines 49 can be protected in a region larger than a region where the wiring lines 49 overlap with the backbone member 14.

4. Description of Relationship between Backbone Member and Hinge Mechanism

The relationship between the backbone member 14 and the hinge mechanism 19 is described. FIG. 7A is a cross-sectional view schematically illustrating the cross-sectional structure along the VIIA-VIIA line in FIG. 1. FIG. 7B is a cross-sectional view schematically illustrating the cross-sectional structure along the VIIB-VIIB line in FIG. 3. FIG. 8 is a cross-sectional view schematically illustrating the cross-sectional structure along the VIII-VIII line in FIG. 2.

As illustrated in FIG. 1 and FIG. 4, the backbone member 14 extends to a position where the backbone member covers the rear surface side of each of the hinge mechanisms 19 to prevent the hinge mechanisms 19 from exposing from between the inner end surfaces 12Aa and 12Ba of the chassis members 12A and 12B.

As illustrated in FIG. 3, FIG. 7A, FIG. 7B, and FIG. 8, the pressing surfaces 42 a, 43 a, and 44 e in both end portions in the longitudinal direction of the backbone member 14 are held between the rear surfaces of the hinge chassis 28A and 28B and the inner surfaces of the chassis members 12A and 12B. Specifically, the pressing surfaces 42 a, 43 a, and 44 e of the backbone member 14 are inserted and disposed in the recessed portions 34 and 35 of the hinge chassis 28A and 28B. Herein, at least the pressing surfaces 42 a and 44 e of the first support member 42 and the reinforcing members 44 a to 44 d are slidably held within the recessed portion 34 of the first support member 42, and are guided between the inner surface of the first chassis 12A and the top surface of the recessed portion 34. More specifically, the recessed portion 34 on the first hinge chassis 28A side guides the backbone member 14 so as to be slidable in the X direction and prevents floating or the like in sliding. The recessed portion 34 has a length dimension capable of coping with a slide distance (slide range) (see FIG. 7A) L of the backbone member 14. Therefore, the recessed portion 34 is longer in the X direction than the recessed portion 35 on the second hinge chassis 28B side.

As illustrated in FIG. 8, the hinge mechanisms 19 each have an engagement protruding portion 50 in the outer surface of each of the hinge chassis 28A and 28B. On the other hand, engagement recessed portions 52 a are formed in the internal surfaces of wall portions 52 which are the side walls along the X direction raised from the inner surfaces of the chassis members 12A and 12B facing the engagement protruding portions 50. The engagement recessed portion 52 a allows the engagement of the engagement protruding portion 50 and regulates at least the movement in a direction where the engagement protruding portion 50 raises from the inner surfaces of the chassis members 12A and 12B.

Therefore, the first hinge chassis 28A is held between the inner surface of the first chassis member 12A and the top surface of the engagement recessed portion 52 a of the wall portion 52 to be prevented from floating. The second hinge chassis 28B is held between the inner surface of the second chassis member 12B and the top surface of the engagement recessed portion 52 a of the wall portion 52 to be prevented from floating. More specifically, the hinge chassis 28A and 28B are provided with the recessed portions 34 and 35 into which the backbone member 14 is inserted on the rear surface sides, and therefore the fixing screws 32 can be fastened only around the recessed portions 34 and 35. Therefore, there is a concern that the hinge chassis 28A and 28B cause floating in the movement of the hinge mechanisms 19. Thus, in the portable information device 10, the hinge chassis 28A and 28B are engaged with and pressed against the wall portions 52 of the chassis members 12A and 12B to prevent the hinge chassis 28A and 28B from floating. The hinge chassis 28A and 28B may be engaged with the engagement recessed portion 52 a without providing the engagement protruding portions 50.

5. Description of Positional Relationship Between Display and Hinge Mechanism

The positional relationship between the display 16 and the hinge mechanism 19 is described. FIG. 9 is an enlarged perspective view of a principal portion illustrating the positional relationship between the display 16 and the hinge mechanism 19. FIG. 10A to FIG. 10D are side operation views schematically illustrating the positional relationship between the display 16 and the hinge mechanism 19 when the pair of chassis members 12A and 12B is rotated from the opened state to the closed state. In FIG. 10A to FIG. 10D, the elements, such as the backbone member 14, are omitted in consideration of ease of viewing, and the second arm 31 and the hinge axes 36 c and 36 d are illustrated by the dashed lines.

First, the display 16 is attached and fixed to the chassis members 12A and 12B through the support plate 18 as first described above. The hinge mechanism 19 is disposed at each of both end portions in the longitudinal direction (Y direction) of the one edge portions (inner end surfaces 12Aa and 12Ba) of the chassis member 12A and 12B and is provided at a position located on the outside of the outer shape of the display 16.

The attachment structure of the display 16 is not limited and, for example, the chassis members 12A and 12B are positioned and fixed through attachment pieces 18 c of the support plate 18 as illustrated in FIG. 3. The attachment pieces 18 c are provided at appropriate positions of an outer peripheral edge portion of the support plate 18 and are projection pieces projecting outwardly from an outer peripheral edge portion of the plate member 18 a. In the attachment pieces 18 c, screwing through-holes are formed in the center. The support plate 18 (display 16) is fastened and fixed to the chassis members 12A and 12B by fastening fixing screws 54 to the chassis members 12A and 12B.

The display 16 is folded into a double-folded state. Therefore, the support plate 18 (display 16) is not provided with the attachment pieces 18 c at a position corresponding to the bending portion 40 a of the backbone member 14. More specifically, the display 16 is not fixed to the chassis members 12A and 12B in a bending region R3 (see FIG. 3 and FIG. 6A) which is a portion corresponding to the backbone member 14, and is fixed and positioned in portions other than the bending region R3. In place of the attachment pieces 18 c, a boss-like female screw portion and the like may be provided in the undersurface of the plate member 18 a, for example.

Thus, the portable information device 10 is folded into a double-folded state in the state where the display 16 is positioned and fixed to the chassis members 12A and 12B. Therefore, depending on the positional relationship between the display 16 and the hinge shafts 36 a to 36 d of the hinge mechanisms 19, a load to the bending region R3 of the display 16 increases in an opening/closing operation, so that smooth bending of the display 16 may be disabled.

Then, the portable information device 10 is configured so that the surface 16 a of the display 16 and axial centers A1 to A4 of the hinge shafts 36 a to 36 d are disposed on the same plane in the state where the first chassis member 12A and the second chassis member 12B are opened into a flat shape (usage form) as illustrated in FIG. 10A. In other words, the axial centers A1 to A4 are disposed on a virtual plane in agreement with the surface 16 a of the display 16 in the state of being opened into a flat shape. Thus, when the chassis members 12A and 12B are operated so as to be folded from the usage form illustrated in FIG. 10A, the arms 30 and 31 rotate around the hinge shafts 36 a to 36 d, so that the chassis members 12A and 12B are gradually folded and the display 16 is also bent as illustrated in FIG.10B and FIG. 10C. Finally, the chassis members 12A and 12B are folded into the double-folded state and the display 16 is also folded into a double-folded state drawing an arc of a predetermined curvature as illustrated in FIG. 10D.

The configuration in which the axial centers Al to A4 of the hinge shafts 36 a to 36 d and the surface 16 a of the display 16 are aligned with each other is applicable also to hinge mechanisms of a 3-shaft structure or 5 or more-shaft structures besides the 4-shaft structure. For example, a hinge mechanism 56 illustrated in FIG. 11 has a configuration in which the first arm 30 is connected to the first hinge shaft 36 a and a fifth hinge shaft 36 e, and the second arm 31 is connected to the fourth hinge shaft 36 d and the fifth hinge shaft 36 e. More specifically, the hinge mechanism 56 has a 3-shaft structure in which the fifth hinge shaft 36 e is shared with the arms 30 and 31. Also in this hinge mechanism 56, a smooth bending operation of the display 16 is enabled by disposing the axial centers A1, A4, and A5 of the hinge shafts 36 a, 36 d, and 36 e and the surface 16 a of the display 16 on the same plane.

6. Description of Operational Effects of Portable Information Device

As described above, the portable information device according to this embodiment has the first chassis member 12A and the second chassis member 12B which are foldable into a double-folded state by connection of one edge portions (edge portions on the sides of the inner end surfaces 12Aa and 12Ba) disposed adjacent to each other by the hinge mechanisms 19 and the display 16 which is provided over the inner surfaces of the first chassis member 12A and the second chassis member 12B and which is foldable into a double-folded state. The portable information device 10 has the backbone member 14 provided throughout between the inner surface of the one edge portion of the first chassis member 12A and the inner surface of the one edge portion of the second chassis member 12B so as to cover a gap between the one edge portion of the first chassis member 12A and the one edge portion of the second chassis member 12B connected by the hinge mechanisms 19. The backbone member 14 is held between the inner surfaces of the first chassis member 12A and the second chassis member 12B, and the rear surfaces of the hinge mechanisms 19 disposed on the inner surfaces and is slidably provided between the inner surface of at least one of the first chassis member 12A and the second chassis member 12B and the rear surface of the hinge mechanism 19 disposed on the inner surface of the at least one of the first chassis member 12A and the second chassis member 12B.

Therefore, even when the two chassis members 12A and 12B are folded into a double-folded state, the backbone member 14 can prevent the hinge mechanisms 19 from being exposed together with the internal elements, such as the main substrate 20, from the gap between the chassis member 12A and 12B, and can secure the appearance quality or the durability of products. Moreover, the backbone member 14 is slidably provided between the inner surface of at least one of the chassis member 12A and 12B and the rear surfaces of the hinge mechanisms 19. Thus, the backbone member 14 smoothly slides following an opening/closing operation of the first chassis member 12A and the second chassis member 12B without causing floating or the like. Therefore, when the two chassis members 12A and 12B are opened into a flat shape, so that a gap therebetween decreases, the back bone member 14 can be prevented from causing floating, a positional shift, or the like within the chassis members 12A and 12B.

The hinge mechanism 19 has the first hinge chassis 28A fixed on the inner surface of the first chassis member 12A, the second hinge chassis 28B fixed on the inner surface of the second chassis member 12B, and the hinge shafts 36 a to 36 d rotatably connecting the first hinge chassis 28A and the second hinge chassis 28B, the first hinge chassis 28A and the second hinge chassis 28B each have recessed portions 34 and 35 communicating with each other on the rear surface sides thereof, and the backbone member 14 is disposed in the recessed portions 34 and 35. Thus, the backbone member 14 is certainly slidably held in the recessed portions 34 and 35 provided in the rear surface sides of the hinge chassis 28A and 28B and can more certainly prevent floating, a positional shift, or the like thereof.

The first hinge chassis 28A is held between the inner surface of the first chassis member 12A and the wall portion 52 raised from the inner surface of the first chassis member 12A and the second hinge chassis 28B is held between the inner surface of the second chassis member 12B and the wall portion 52 raised from the inner surface of the second chassis member 12B. As described above, the hinge chassis 28A and 28B have the recessed portions 34 and for holding the backbone member 14, respectively. Therefore, the fixing screws 32 can be fastened only at positions avoiding the recessed portions 34 and 35. Then, in the portable information device 10, the chassis members 12A and 12B are engaged with and pressed against the wall portions 52 of the hinge chassis 28A and 28B to prevent floating or rattling in operations.

The hinge mechanism 19 is disposed at each of both end portions in the longitudinal direction of one edge portions of the first chassis member 12A and the second chassis member 12B. The wall portions 52 of the first hinge chassis 28A and the second hinge chassis 28B each form the side walls of the portable information device 10, and the first hinge chassis 28A and the second hinge chassis 28B are engaged with the recessed portions 52 a formed in the inner wall surfaces of the wall portions 52. Thus, the hinge chassis 28A and 28B can be more firmly fixed.

In the portable information device 10, the hinge mechanism 19 is disposed at each of both end portions in the longitudinal direction of the one edge portions of the first chassis member 12A and the second chassis member 12B, and the hinge mechanisms 19 are provided at the positions located on the outside of the outer shape of the display 16. Each of the hinge mechanisms 19 has the first hinge chassis 28A fixed on the inner surface of the first chassis member 12A, the second hinge chassis 28B fixed on the inner surface of the second chassis member 12B, and the hinge shafts 36 a to 36 d rotatably connecting the first hinge chassis 28A and the second hinge chassis 28B. At least portions other than bending region R3 corresponding to the backbone member 14 of the display 16 are positioned and fixed to the first chassis member 12A and the second chassis member 12B. The surface 16 a of the display 16 and the axial centers A1 to A4 of the hinge shafts 36 a to 36 d are disposed on the same plane in the usage form in which the first chassis member 12A and the second chassis member 12B are opened into a flat shape.

Therefore, in the operation of folding the chassis members 12A and 12B, which are opened into a flat shape, into a double-folded state, the display 16 is smoothly folded into a double-folded state following the rotation operation of the hinge mechanisms 19, in spite of the peripheral length difference. This prevents the application of an excessive load to the display 16 in opening/closing of the chassis members 12A and 12B and causing floating or defects. More specifically, in the configuration examples illustrated in FIG. 10A to FIG. 10D, for example, the surface 16 a of the display 16 in the state illustrated in FIG. 10A is folded without involving the movement of a central portion between the hinge shafts 36 b and 36 c at the center in the bending operation illustrated in FIG. 10A to FIG. 10D. Thus, the display 16 can perform a smooth bending operation along the bending track when designing the same.

It is a matter of course that the present invention is not limited to the embodiments described above and can be freely altered without deviating from the scope of the present invention.

One edge side of the backbone member 14 may be slidably held by the second chassis member 12B and the other edge side thereof may be fixed to the first chassis member 12A. Moreover, the backbone member 14 may be slidably held by each of the chassis members 12A and 12B. 

We claim:
 1. A portable information device comprising: a first chassis member and a second chassis member foldably connected by connection of one edge portions disposed adjacent to each other by a hinge mechanism; a display over inner surfaces of the first chassis member and the second chassis member and which is foldable into a double-folded state; and a backbone member throughout and between the inner surface of the one edge portion of the first chassis member and the inner surface of the one edge portion of the second chassis member so as to cover a gap between the one edge portion of the first chassis member and the one edge portion of the second chassis member connected by the hinge mechanism, wherein the backbone member is held between the inner surfaces of the first chassis member and the second chassis member, and rear surfaces of the hinge mechanisms disposed on the inner surfaces, and is slidably provided between the inner surface of at least one of the first chassis member and the second chassis member and a rear surface of the hinge mechanism disposed on the inner surface of the at least one of the first chassis member and the second chassis member.
 2. The portable information device according to claim 1, wherein: the hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, the first hinge chassis and the second hinge chassis each have a recessed portion communicating with each other on rear surface sides thereof, and the backbone member is disposed in the recessed portions.
 3. The portable information device according to claim 2, wherein: the backbone member is on the inner surface of the one edge portion of the first chassis member so as to be slidable in a direction from the second chassis member to the first chassis member along the inner surface, and is non-slidably fixed to the inner surface of the one edge portion of the second chassis member, and the recessed portion of the first hinge chassis extends over a slide range of the backbone member.
 4. The portable information device according to claim 1, wherein: the hinge mechanism is at each of both end portions in a longitudinal direction of the one edge portions in the first chassis member and the second chassis member.
 5. The portable information device according to claim 1, wherein: the hinge mechanism has the first hinge chassis fixed on the inner surface of the first chassis member, the second hinge chassis fixed on the inner surface of the second chassis member, and the hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, the first hinge chassis is held between an inner surface of the first chassis member and a wall portion raised from the inner surface of the first chassis member, and the second hinge chassis is held between an inner surface of the second chassis member and a wall portion raised from the inner surface of the second chassis member.
 6. The portable information device according to claim 5, wherein: the hinge mechanism is at each of both end portions in the longitudinal direction of the one edge portions in the first chassis member and the second chassis member, the wall portions of the first hinge chassis and the second hinge chassis each form side walls of the portable information device, and the first hinge chassis and the second hinge chassis are engaged with the recessed portions formed in inner wall surfaces of the wall portions.
 7. The portable information device according to claim 1, wherein: the hinge mechanism is at each of both end portions in a longitudinal direction of the one edge portions in the first chassis member and the second chassis member, each hinge mechanism is at a position located on an outside of an outer shape of the display, each hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, at least a portion other than a bending region corresponding to the backbone member of the display is positioned and fixed to the first chassis member and the second chassis member, and a surface of the display and an axial center of the hinge shaft are disposed on a same plane in a state where the first chassis member and the second chassis member are opened into a flat shape.
 8. A portable information device comprising: a first chassis member and a second chassis member foldably connected by connection of one edge portions disposed adjacent to each other by a hinge mechanism; and a display over inner surfaces of the first chassis member and the second chassis member and which is foldable into a double-folded state, wherein: the hinge mechanism is at each of both end portions in a longitudinal direction of the one edge portions in the first chassis member and the second chassis member, each hinge mechanism is at a position located on an outside of an outer shape of the display, each hinge mechanism has a first hinge chassis fixed on the inner surface of the first chassis member, a second hinge chassis fixed on the inner surface of the second chassis member, and a hinge shaft rotatably connecting the first hinge chassis and the second hinge chassis, the display is positioned and fixed to the first chassis member and the second chassis member, and a surface of the display and an axial center of the hinge shaft are disposed on a same plane in a state where the first chassis member and the second chassis member are opened into a flat shape.
 9. The portable information device according to claim 7, wherein: each hinge mechanism has a first arm, one end portion of which is rotatably connected to the first hinge chassis through a first hinge shaft and another end portion of which is rotatably connected to the second hinge chassis through a second hinge shaft; and a second arm, one end portion of which is rotatably connected to the second hinge chassis through a third hinge shaft and another end portion of which is rotatably connected to the first hinge chassis through a fourth hinge shaft, and a surface of the display and axial centers of the first hinge shaft, the second hinge shaft, the third hinge shaft, and the fourth hinge shaft are disposed on a same plane in a state where the first chassis member and the second chassis member are opened into a flat shape. 